不能判断原因, 会不会是保护了, 手册给出的保护功能不少啊
Safety Protection
Input Overvoltage Protection
Battery Thermistor Sense Hot and Cold
Charge Suspend
Battery Detection
Reverse Protection Input FET
Programmable Safety Timer
Charge Overcurrent Protection
Battery Short Protection
Battery Overvoltage Protection
Thermal Shutdown
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